Thanks for all the comments. I think I'll start by cleaning out all the crud. Currently assessing the other side which has at least as much rot and maybe a little more.Thanks again.p.s. - (-vellu) Looks like old car rust and dirt in Finland is the same as here in the states!

I just don't subscribe to a one size fits alll repair. I cater to each area , and replace as needed. It may not be as profitable as what you are accustomed to, but it doesn't cut unnecessarily into a nice car where unwarranted. It is on a as needed basis only. BUT if cutting every time gives you the warm fuzzies than ok.

That is what cutting out that small piece out is doing, catering to the area. Every job is different. I don't replace entire sections or panels if it's not needed. Using mig wire alone in the rot holes as you suggested is not going to repair that area. The metal is rotten and thin, there is a piece missing and those holes larger than pinholes. You are correct, one size does not fit all. Each job gets evaluated and repaired accordingly. This is not about profiting or doing more than is required at the customer's expense.